USS and SAE Washer Dimensions

Flat Washer Measurements
Size USS SAE
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
#2 - - - 3/32" 1/4" 0.020"
#4 - - - 1/8" 5/16" 0.032"
#6 - - - 5/32" 3/8" 0.049"
#8 - - - 3/16" 7/16" 0.049"
#10 - - - 7/32" 1/2" 0.049"
#12 - - - 1/4" 9/16" 0.065"
1/4" 5/16" 0.734" 0.065" 9/32" 5/8" 0.065"
5/16" 3/8" 7/8" 0.083" 11/32" 11/16" 0.065"
3/8" 7/16" 1" 0.083" 13/32" 13/16" 0.065"
7/16" 1/2" 1-1/4" 0.083" 15/32" 15/16" 0.065"
1/2" 9/16" 1-3/8" 0.109" 17/32" 1-1/16" 0.095"
9/16" 5/8" 1-15/32" 0.109" 19/32" 1-5/32" 0.095"
5/8" 11/16" 1-3/4" 0.134" 21/32" 1-5/16" 0.095"
3/4" 13/16" 2" 0.148" 13/16" 1-15/32" 0.134"
7/8" 15/16" 2-1/4" 0.165" 15/16" 1-3/4" 0.134"
1" 1-1/16" 2-1/2" 0.165" 1-1/16" 2" 0.134"
1-1/8" 1-1/4" 2-3/4" 0.165" - - -
1-1/4" 1-3/8" 3" 0.165" - - -
1-3/8" 1-1/2" 3-1/4" 0.180" - - -
1-1/2" 1-5/8" 3-1/2" 0.180" - - -
1-5/8" 1-3/4" 3-3/4" 0.180" - - -
1-3/4" 1-7/8" 4" 0.180" - - -
2" 2-1/8" 4-1/2" 0.213" - - -